FAN1084DX [ROCHESTER]
1.5 V-3.6 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.5 V DROPOUT, PSSO2, PLASTIC, TO-252, 3 PIN;
| 型号： | FAN1084DX |
| 厂家： | 
Rochester Electronics |
| 描述： | 1.5 V-3.6 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.5 V DROPOUT, PSSO2, PLASTIC, TO-252, 3 PIN 输出元件 调节器 |
| 文件： | 总14页 (文件大小：810K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN1 0 8 4
4 .5 A Ad ju s t a b le /Fix e d Lo w Dro p o u t Lin e a r Re g u la t o r
Features
Description
• Fast transient response
The FAN1084, FAN1084-1.5, and FAN1084-3.3 are low
dropout three-terminal regulators with 4.5A output current
capability. These devices have been optimized for low voltage
• Low dropout voltage at up to 4.5A
• Load regulation: 0.5% typical
• On-chip thermal limiting
applications including V bus termination, where transient
TT
• Standard TO-220, TO-263 center cut, and TO-252
packages
response and minimum input voltage are critical. The
FAN1084 is ideal for low voltage microprocessor applica-
tions requiring a regulated output from 1.5V to 3.6A with an
input supply of 5V or less. The FAN1084-1.5 offers fixed
Applications
1.5V with 4.5A current capabilities for GTL+ bus V
TT
• Desktop PCs, RISC and embedded processors’ supply
• GTL, SSTL logic Reference bus supply
• Low voltage V logic supply
CC
termination. The FAN1084-3.3 offers a fixed 3.3V output
at 4.5A.
• Battery-powered circuitry
On-chip thermal limiting provides protection against any
combination of overload and ambient temperature that
would create excessive junction temperatures.
• Post regulator for switching supply
• Cable and ADSL modems’ DSP core supply
• Set Top Boxes and Web Boxes modules’ supply
The FAN1084 series regulators are available in the industry-
standard TO-220, TO-263 center cut, and TO-252 (DPAK)
power packages.
Application Diagrams
FAN1084
V
IN
V
OUT
V
IN
= 5V
2.5V at 4.5A
+
22µF
+
ADJ
124Ω
124Ω
10µF
FAN1084-1.5
V
IN
V
OUT
V
IN
= 3.3V
1.5V at 4.5A
+
+
GND
22µF
10µF
REV. 1.0.8 11/10/03
FAN1084
PRODUCT SPECIFICATION
Pin Assignments
FAN1084T-3.3
FAN1084T-1.5
FAN1084T
FRONT VIEW
FRONT VIEW
FAN1084M-3.3†
FAN1084M-1.5
FAN1084M
FRONT VIEW
FAN1084D-3.3
FAN1084D-1.5 FAN1084D
FRONT VIEW
FRONT VIEW FRONT VIEW
Tab is out.
1
2
3
1
2
3
Tab is out.
1
2
3
1
2
3
1
2
3
1
2
3
GND IN
ADJ
IN
ADJ OUT IN
GND OUT IN
GND
IN
ADJ
IN
3-Lead Plastic TO-252
=3°C/W*
3-Lead Plastic TO-220
ΘJC=3°C/W*
3-Lead Plastic TO-263
Θ
ΘJC=3°C/W*
JC
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, ΘJA can vary from
30°C/W to more than 40°C/W. Other mounting techniques may provide better power dissipation than 30°C/W.
†FAN1084M-3.3 also available with uncut center lead.
Absolute Maximum Ratings
Parameter
Min.
Max.
7
Unit
V
V
IN
Operating Junction Temperature Range
Storage Temperature Range
0
125
150
300
°C
°C
°C
–65
Lead Temperature (Soldering, 10 seconds)
2
REV. 1.0.8 11/10/03
PRODUCT SPECIFICATION
FAN1084
Electrical Characteristics
Operating Conditions: 4.75 ≤ V < 5.25V, T = 25°C unless otherwise specified.
IN
j
Parameter
Conditions
Min.
1.23
Typ.
1.250
1.5
Max
1.27
1.525
3.366
2
Units
V
Reference Voltage3
Output Voltage5
Output Voltage6
Line Regulation1, 2
Load Regulation1, 2
Dropout Voltage
Current Limit
Adj connected to ground, I = 10mA
OUT
I
I
I
= 10mA
= 10mA
= 10mA
1.475
3.234
V
OUT
OUT
OUT
3.3
V
0.5
%
10mA ≤ I
OUT
≤ 4.5A
0.5
2.5
%
∆V
= 2%, I
OUT
= 4.5A
1.5
V
REF%
(V – V
) = 2V
OUT
5.5
35
10
4
A
IN
Adjust Pin Current3
Mimimum Load Current4
Quiescent Current4
100
µΑ
mA
mA
°C/W
°C/W
°C
1.5V ≤ (V – V
) ≤ 5.75V
IN OUT
V
= 5V
IN
TO-220
TO-263 Center Cut, TO-252
Thermal Resistance,
Junction to Case
3
3
Thermal Shutdown4
150
Notes:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation. Power dissipation is determined by input/
output differential and the output currrent. Guaranteed maximum output power will not be available over the full input/output
voltage range.
3. FAN1084 only.
4. Guaranteed by design.
5. FAN1084-1.5 only.
6. FAN1084-3.3 only.
Typical Performance Characteristics
20
15
10
5
0
25 45
65
85 105 125
CASE TEMPERATURE
Figure 1. Maximum Power Dissipation
REV. 1.0.8 11/10/03
3
FAN1084
PRODUCT SPECIFICATION
Typical Performance Characteristics (Continued)
1.5
∆I = 4.5A
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
T=0°C
T=125°C
T=25°C
0
1
2
3
4
5
6
OUTPUT CURRENT (A)
Figure 2. Dropout Voltage vs. Output Current
Figure 3. Load Regulation vs. Temperature
1.275
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
1
OUT
VOUT = 3.6V1
VOUT = 3.3V1
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 4. Reference Voltage vs. Temperature
Figure 5. Output Voltage vs. Temperature
5
4
3
2
1
0
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 6. Minimum Load Current vs. Temperature
Figure 7. Adjust Pin Current vs. Temperature
4
REV. 1.0.8 11/10/03
PRODUCT SPECIFICATION
FAN1084
Typical Performance Characteristics (continued)
8.0
7.0
6.0
5.0
4.0
90
80
70
60
50
40
30
20
10
0
(V – V
IN
) ≤ 3V
OUT
0.5V ≤ V
≤ 2V
RIPPLE
= 5A
I
OUT
10
100
1K
FREQUENCY (Hz)
10K
100K
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 8. Short-Circuit Current vs. Temperature
Figure 9. Ripple Rejection vs. Frequency
2.5
2
1.5
1
Area of Instability
0.5
Stable Area
1000
0
0
2000
3000
4000
LOAD CURRENT (mA)
Figure 10. Stability Region V /V
IN OUT
= 5V/1.5V
REV. 1.0.8 11/10/03
5
FAN1084
PRODUCT SPECIFICATION
The adjust pin can be driven on a transient basis ±7V with
respect to the ouput, without any device degradation. As with
any IC regulator, exceeding the maximum input-to-output
voltage differential causes the internal transistors to break
down and none of the protection circuitry is then functional.
Applications Information
General
The FAN1084, FAN1084-1.5, and FAN1084-3.3 are three-
terminal regulators optimized for GTL+ V termination
TT
and logic applications. These devices are short-circuit pro-
tected, and offer thermal shutdown to turn off the regulator
when the junction temperature exceeds about 150°C. The
FAN1084 series provides low dropout voltage and fast
transient response. Frequency compensation uses capacitors
with low ESR while still maintaining stability. This is critical
in addressing the needs of low voltage high speed micro-
processor buses like GTL+.
D1
1N4002
(OPTIONAL)
FAN1084
V
IN
V
OUT
IN
OUT
+
+
C1
10µF
C2
22µF
ADJ
R1
R2
Stability
+
CADJ
The FAN1084 series requires an output capacitor as a part of
the frequency compensation. It is recommended to use a 22µF
solid tantalum or a 100µF aluminum electrolytic on the output
to ensure stability. The frequency compensation of these devices
optimizes the frequency response with low ESR capacitors.
In general, it is suggested to use capacitors with an ESR of
<0.2Ω. It is also recommended to use bypass capacitors such
as a 22µF tantalum or a 100µF aluminum on the adjust pin of
the FAN1084 for low ripple and fast transient response.
When these bypassing capacitors are not used at the adjust pin,
smaller values of output capacitors provide equally good
results. Refer to Typical Performance Characteristics for
graph of stability of output capacitance ESR vs load current.
D1
1N4002
(OPTIONAL)
FAN1084-1.5
V
IN
V
IN
OUT
OUT
+
+
C1
10µF
C2
22µF
GND
Protection Diodes
Figure 2. Optional Protection
In normal operation, the FAN1084 series does not require
any protection diodes. For the FAN1084, internal resistors
limit internal current paths on the adjust pin. Therefore, even
with bypass capacitors on the adjust pin, no protection diode
is needed to ensure device safety under short-circuit condi-
tions.
Ripple Rejection
In applications that require improved ripple rejection, a bypass
capacitor from the adjust pin of the FAN1084 to ground
reduces the output ripple by the ratio of V
/1.25V. The
OUT
impedance of the adjust pin capacitor at the ripple frequency
should be less than the value of R1 (typically in the range of
100Ω to 120Ω) in the feedback divider network in Figure 2.
Therefore, the value of the required adjust pin capacitor is a
function of the input ripple frequency. For example, if R1
equals 100Ω and the ripple frequency equals 120Hz, the
adjust pin capacitor should be 22µF. At 10kHz, only 0.22µF is
needed.
A protection diode between the input and output pins is
usually not needed. An internal diode between the input and
the output pins on the FAN1084 series can handle micro-
second surge currents of 50A to 100A. Even with large value
output capacitors it is difficult to obtain those values of surge
currents in normal operation. Only with large values of
output capacitance, such as 1000µF to 5000µF, and with the
input pin instantaneously shorted to ground can damage
occur. A crowbar circuit at the input can generate those
levels of current; a diode from output to input is then recom-
mended, as shown in Figure 2. Usually, normal power supply
cycling or system “hot plugging and unplugging” will not
generate current large enough to do any damage.
Output Voltage
The FAN1084 regulator develops a 1.25V reference voltage
between the ouput pin and the adjust pin (see Figure 3). Placing
a resistor R1 between these two terminals causes a constant
current to flow through R1 and down through R2 to set the
overall output voltage. Normally, this current is the specified
minimum load current of 10mA.
6
REV. 1.0.8 11/10/03
PRODUCT SPECIFICATION
FAN1084
The current out of the adjust pin adds to the current from R1.
Its output voltage contribution is small and only needs consid-
eration when a very precise output voltage setting is required.
R
P
Parasitic
Line Resistance
FAN1084
OUT
FAN1084
V
IN
IN
V
V
OUT
IN
OUT
IN
+
+
ADJ
C1
10µF
C2
22µF
ADJ
VREF
R1
R2
R1*
R2*
IADJ
35µA
R
L
*Connect R1 to case
Connect R2 to load
Figure 3. Connection for Best Load Regulation
Figure 5. Connection for Best Load Regulation
Load Regulation
It is not possible to provide true remote load sensing because
the FAN1084 series are three-terminal devices. Load regula-
tion is limited by the resistance of the wire connecting the reg-
ulator to the load. Load regulation per the data sheet
Thermal Conditions
The FAN1084 series protect themselves under overload con-
ditions with internal power and thermal limiting circuitry.
However, for normal continuous load conditions, do not
exceed maximum junction temperature ratings. It is impor-
tant to consider all sources of thermal resistance from junc-
tion-to-ambient. These sources include the junction-to-case
resistance, the case-to-heatsink interface resistance, and the
heat sink resistance. Thermal resistance specifications have
been developed to more accurately reflect device tempera-
ture and ensure safe operating temperatures. The electrical
characteristics section provides a separate thermal resistance
and maximum junction temperature for both the control cir-
cuitry and the power transistor. Calculate the maximum junc-
tion temperature for both sections to ensure that both thermal
limits are met.
specification is measured at the bottom of the package.
For fixed voltage devices, negative side sensing is a true
Kelvin connection with the ground pin of the device returned
to the negative side of the load. This is illustrated in Figure 4.
R
P
Parasitic
Line Resistance
FAN1084-1.5
IN OUT
V
IN
GND
R
L
For example, look at using a FAN1084T to generate 4.5A @
1.5V from a 3.3V source (3.2V to 3.6V).
Figure 4. Connection for Best Load Regulation
Assumptions
• V = 3.4V worst case
IN
For adjustable voltage devices, negative side sensing is a true
Kelvin connection with the bottom of the output divider
returned to the negative side of the load. The best load regula-
tion is obtained when the top of the resistor divider R1 connects
directly to the regulator output and not to the load. Figure 5
illustrates this point.
• V
• I
OUT
= 1.475V worst case
= 4.5A continuous
OUT
• T = 60°C
A
• θ
= 5°C/W (assuming both a heatsink and
Case-to-Ambient
a thermally conductive material)
The power dissipation in this application is:
If R1 connects to the load, then the effective resistance
between the regulator and the load would be:
P
D
= (V – V
) * (I ) = (3.6 – 1.475) * (4.5) = 9.6W
OUT
IN OUT
From the specification table:
T = T + (P ) * (θ
R X (1 + R2/R1), R = Parasitic line Resistance
P
P
+ θ )
JC
J
A
D
Case-to-Ambient
= 60 + (9.6) * (5 + 3) = 137°C
The connection shown in Figure 5 does not multiply R by the
P
divider ration. As an example, R is about four milliohms per
P
The junction temperature is below the maximum thermal limit.
foot with 16-gauge wire. This translates to 4mV per foot at 1A
load current. At higher load currents, this drop represents a
significant percentage of the overall regulation. It is important
to keep the positive lead between the regulator and the load as
short as possible and to use large wire or PC board traces.
REV. 1.0.8 11/10/03
7
FAN1084
PRODUCT SPECIFICATION
Junction-to-case thermal resistance is specified from the IC
junction to the bottom of the case directly below the die. This
is the lowest resistance path for heat flow. Proper mounting
ensures the best thermal flow from this area of the package to
the heat sink. Use of a thermally conductive material at the
case-to-heat sink interface is recommended. Use a thermally
conductive spacer if the case of the device must be electri-
cally isolated and include its contribution to the total thermal
resistance. The cases of the FAN1084 series are directly con-
nected to the output of the device.
U1
FAN1084
V
IN
V
2.5V
IN
OUT
OUT
+
+
R1
124Ω
C1
10µF
C3
ADJ
+
100µF
C2
100µF
R2
124Ω
Figure 6. Application Circuit
Table 1. Bill of Materials for Application Circuit for the FAN1084
Item
C1
Quantity
Manufacturer
Xicon
Part Number
L10V10
Description
10µF, 10V Aluminum
100µF, 10V Aluminum
124Ω, 1%
1
2
2
1
C2, C3
R1, R2
U1
Xicon
L10V100
Generic
Fairchild
FAN1084T
4.5A Regulator
U1
RC1084-1.5
IN OUT
V
V
IN = 3.3V
OUT 1.5V
+
+
GND
C1
C3
10µF
100µF
Figure 7. Application Circuit (FAN1084-1.5)
Table 2. Bill of Materials for Application Circuit for the FAN1084-1.5
Item
C1
Quantity
Manufacturer
Xicon
Part Number
L10V10
Description
10µF, 10V Aluminum
100µF, 10V Aluminum
4.5A Regulator
1
1
1
C3
Xicon
L10V100
U1
Fairchild
FAN1084T-1.5
8
REV. 1.0.8 11/10/03
PRODUCT SPECIFICATION
FAN1084
Mechanical Dimensions
3-Lead TO-263 Center Cut Package
Notes:
Inches
Millimeters
1. Dimensions are exclusive of mold flash and metal burrs.
2. Standoff-height is measured from lead tip with ref. to Datum -B-.
3. Foot length is measured with ref. to Datum -A- with lead surface
(at inner R).
4. Dimensiuon exclusive of dambar protrusion or intrusion.
5. Formed leads to be planar with respect to one another at seating
place -C-.
Symbol
Notes
Min.
Max.
Min.
Max.
A
.160
.020
.049
.045
.340
.380
.190
.036
.051
.055
.380
.405
4.06
0.51
1.25
1.14
8.64
9.65
4.83
0.91
1.30
1.40
9.65
10.29
b
b2
c2
D
E
e
.100 BSC
2.54 BSC
L
.575
.625
.110
.055
14.61
15.88
L1
L2
.090
—
2.29
—
2.79
1.40
1.78
0.78
8°
L3
R
.050
.017
0°
1.27
0.43
0°
.070
.019
8°
α
E
@PKG/
@HEATSINK
L2
c2
D
E-PIN
L
R (2 PLCS)
b2
L1
L3
b
e
-B- -A-
A
-C-
REV. 1.0.8 11/10/03
9
FAN1084
PRODUCT SPECIFICATION
Mechanical Dimensions
3-Lead TO-263 Package
Notes:
Inches
Millimeters
1. Dimensions are exclusive of mold flash and metal burrs.
2. Standoff-height is measured from lead tip with ref. to Datum -B-.
3. Foot length is measured with ref. to Datum -A- with lead surface
(at inner R).
4. Dimensiuon exclusive of dambar protrusion or intrusion.
5. Formed leads to be planar with respect to one another at seating
place -C-.
Symbol
Notes
Min.
Max.
Min.
Max.
A
.160
.020
.049
.045
.340
.380
.190
.036
.051
.055
.380
.405
4.06
0.51
1.25
1.14
8.64
9.65
4.83
0.91
1.30
1.40
9.65
10.29
b
b2
c2
D
E
e
.100 BSC
2.54 BSC
L
.575
.090
—
.017
0°
.625
14.61
2.29
—
0.43
0°
15.88
2.79
1.40
0.78
8°
L1
L2
R
.110
.055
.019
8°
α
E
@PKG/
@HEATSINK
L2
c2
D
E-PIN
L
R (2 PLCS)
b2
L1
b
e
-B- -A-
A
-C-
10
REV. 1.0.8 11/10/03
PRODUCT SPECIFICATION
FAN1084
Mechanical Dimensions (continued)
3-Lead TO-220 Package
Inches
Millimeters
Symbol
Notes
Min.
Max.
Min.
Max.
A
.140
.015
.045
.014
.139
.560
.380
.090
.190
.045
.190
.040
3.56
.38
4.83
1.02
b
b1
c1
øP
D
1.14
.36
.070
.022
.161
1.78
.56
3.53
14.22
9.65
2.29
4.83
1.14
4.09
.650
.420
.110
.210
—
16.51
10.67
2.79
5.33
—
E
e
e1
e3
F
.020
.230
.080
.055
.270
.115
.51
1.40
6.87
2.92
H1
J1
L
5.94
2.04
.500
.580
12.70
14.73
L1
Q
α
.250 BSC
6.35 BSC
.100
.135
2.54
3.43
Notes:
3°
7°
3°
7°
1. Dimension c1 apply for lead finish.
H1
Q
L
b1
e3
e
e1
E
b
L1
E-PIN
øP
α (5X)
c1
A
J1
F
D
REV. 1.0.8 11/10/03
11
FAN1084
PRODUCT SPECIFICATION
Mechanical Dimensions (continued)
3-Lead TO-252 Package
A
6.73
6.35
6.00 MIN
5.46
5.21
L3
4
6.50 MIN
D
6.25
1.02
0.84
C
3.00 MIN
2.30
2
1
3
1
3
1.14
0.78
1.40 MIN
(0.59)
0.89
4.80
2.29
0.54
4.57
M
M
A
0.25
C
LAND PATTERN RECOMMENDATION
B
2.38
2.18
SEE
NOTE D
0.58
0.48
E1
4
D1
10.41
9.40
SEE
DETAIL A
2
1
3
0.10
B
NOTES: UNLESS OTHERWISE SPECIFIED
0.51
GAGE PLANE
A) ALL DIMENSIONS ARE IN MILLIMETERS.
B) THIS PACKAGE CONFORMS TO JEDEC, TO-252,
ISSUE C. VARIATION AA & AB, DATED NOV. 1999.
0.61
0.48
(1.54)
C) DIMENSIONING AND TOLERANCING PER
10°
0°
ASME Y14.5–1994.
D) HEAT SINK TOP EDGE COULD BE IN CHAMFERED
CORNERS OR EDGE PROTRUSION.
1.78
1.40
E) DIMENSIONS L3, D, E1 & D1 TABLE:
0.127 MAX
SEATING PLANE
OPTION AA OPTION AB
L3 0.89 – 1.27 1.52 – 2.03
2.90
D
5.97 – 6.22 5.33 – 5.59
DETAIL A
E1 4.32 MIN
D1 5.21 MIN
3.81 MIN
4.57 MIN
(ROTATED –90°
SCALE 12X
12
REV. 1.0.8 11/10/03
FAN1084
PRODUCT SPECIFICATION
Ordering Information
Product Number
FAN1084MC
FAN1084T
Package
TO-263 Center Cut
TO-220
FAN1084D
TO-252
FAN1084MC15
FAN1084T15
FAN1084D15
FAN1084MC33
FAN1084M33
FAN1084T33
FAN1084D33
TO-263 Center Cut
TO-220
TO-252
TO-263 Center Cut
TO-263
TO-220
TO-252
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
11/10/03 0.0m 003
Stock#DS30001084
2001 Fairchild Semiconductor Corporation
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